<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" />
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像：TODO -->

      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">

        <!-- 头衔缩略图 -->
        <pan-thumb :image="teacher.avatar"/>
        <!-- 文件上传按钮 -->
        <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
        </el-button>

        <!--
    v-show：是否显示上传组件
    :key：类似于id，如果一个页面多个图片上传控件，可以做区分
    :url：后台上传的url地址
    @close：关闭上传组件
    @crop-upload-success：上传成功后的回调
      <input type="file" name="file"/>
    -->
        <image-cropper
          v-show="imagecropperShow"
          :width="300"
          :height="300"
          :key="imagecropperKey"
          :url="BASE_API+'/eduoss/file'"
          field="file"
          @close="close"
          @crop-upload-success="cropSuccess"/>
      </el-form-item>

      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>

  </div>
</template>


<script>
import teacherApi from "@/api/edu/teacher";
import ImageCropper from '@/components/ImageCropper'
import PanThumb from '@/components/PanThumb'

export default {

  components: {ImageCropper,PanThumb},
  data(){
    return{
      teacher: {
        name: '',
        sort: 0,
        level: 1,
        career:'',
        intro: '',
        avatar: ''
      },

      imagecropperShow: true,
      //上传组件的唯一标识
      imagecropperKey: 0,
      // 保存按钮是否禁用
      saveBtnDisabled: false,
      // 获取BASE_API的值
      BASE_API: process.env.BASE_API,
    }
  },

  created(){
    this.init()
  },

  //监听路由变化
  watch: {
    //路由变化的方式  路由发生变化，方法就会执行
    $route(to,from){
      this.init()
    }
  }
  ,

  methods: {
    // 关闭上传弹窗的方法
    close(){
      this.imagecropperShow = false

      //上传组件初始化
      this.imagecropperKey = this.imagecropperKey + 1
    },
    // 上传成功的方法
    cropSuccess(data){

      //关闭弹框
      this.imagecropperShow = false;
      // 上传之后接口返回的图片地址
      this.teacher.avatar = data.url
      //每次上传成功后，key变化
      this.imagecropperKey = this.imagecropperKey + 1
    },

    // 根据id查询讲师
    getTeacherById(id){
      teacherApi.getTeacherInfo(id)
        .then(response => {
          this.teacher = response.data.teacher;
        })
    },

    saveOrUpdate(){
      // 判断修改还是添加 根据teacher是否有id
      console.log(this.teacher.id)
      if(!this.teacher.id){
        //添加
        this.saveTeacher()
      }else{
        this.updateTeacherById(this.teacher.id)
      }


    },

    // 修改讲师的方法
    updateTeacherById(id){
      teacherApi.updateTeacher(id,this.teacher)
        .then(response => {
          // 提示信息
          this.$message({
            type: 'success',
            message: '修改成功'
          })

          //回到列表页面  路由跳转
          this.$router.push({path:'/teacher/table'})
        })
    },




    saveTeacher(){
      teacherApi.addTeacher(this.teacher)
        //添加成功
        .then(response => {
          //提示成功
          this.$message({
            type: 'success',
            message: '添加成功！'
          })
          //回到列表页面  路由跳转
          this.$router.push({path:'/teacher/table'})
        })
    },

    init(){
      // 页面渲染之前执行
      if(this.$route.params && this.$route.params.id){
        // 从路径中获取id的值
        const id = this.$route.params.id
        // 调用根据id查询的方法
        this.getTeacherById(id)
      }else{
        //路径没有id值，是添加操作
        //清空表单
        this.teacher = {}
      }
    }
  }
}
</script>
